后端分页组件实例

朱雀 2023-06-08 09:28 317阅读 0赞

/**
     * 分页相关信息
     */
    public class Page {
        //当前页码
        private int current=1;
        //显示的上限
        private int limit=10;
        //数据总数
        //用于计算页数
        private int rows;
        //路径
        private String path;
    
        public int getCurrent() {
            return current;
        }
    
        public void setCurrent(int current) {
            if (current >= 1) {
                this.current = current;
            }
        }
        public int getLimit() {
            return limit;
        }
    
        public void setLimit(int limit) {
            if (limit >= 1 && limit<=100) {
                this.limit = limit;
            }
        }
    
        public int getRows() {
            return rows;
        }
    
        public void setRows(int rows) {
            if(rows>=0){
                this.rows = rows;
            }
        }
    
        public String getPath() {
            return path;
        }
    
        public void setPath(String path) {
            this.path = path;
        }
    
        /**
         * 获取起始行
         * @return
         */
        public int getOffset(){
            return (current-1)*limit;
        }
    
        /**
         * 获取起始页码
         *
         * @return
         */
        public int getFrom() {
            int from = current - 2;
            return from < 1 ? 1 : from;
        }
    
        /**
         * 获取结束页码
         *
         * @return
         */
        public int getTo() {
            int to = current + 2;
            int total = getTotal();
            return to > total ? total : to;
        }
        /**
         * 获取总页数
         *
         * @return
         */
        public int getTotal() {
            // rows / limit [+1]
            if (rows % limit == 0) {
                return rows / limit;
            } else {
                return rows / limit + 1;
            }
        }
    }

@RequestMapping(path = "/index", method = RequestMethod.GET)
        public String getIndexPage(Model model, Page page,
                                   @RequestParam(name = "orderMode", defaultValue = "0") int orderMode) {
            // 方法调用前,SpringMVC会自动实例化Model和Page,并将Page注入Model.
            // 所以,在thymeleaf中可以直接访问Page对象中的数据.
            page.setRows(discussPostService.findDiscussPostRows(0));
            page.setPath("/index?orderMode=" + orderMode);
    
            List<DiscussPost> list = discussPostService.findDiscussPosts(0, page.getOffset(), page.getLimit(),orderMode);
            List<Map<String, Object>> discussPosts = new ArrayList<>();
            ......
            model.addAttribute("discussPosts", discussPosts);
            model.addAttribute("orderMode", orderMode);
    
            return "/index";
        }

<nav class="mt-5" th:if="${page.rows>0}" th:fragment="pagination">
    					<ul class="pagination justify-content-center">
    						<li class="page-item">
    							<a class="page-link" th:href="@{${page.path}(current=1)}">首页</a>
    						</li>
    						<li th:class="|page-item ${page.current==1?'disabled':''}|">
    							<a class="page-link" th:href="@{${page.path}(current=${page.current-1})}">上一页</a></li>
    						<li th:class="|page-item ${i==page.current?'active':''}|" th:each="i:${#numbers.sequence(page.from,page.to)}">
    							<a class="page-link" th:href="@{${page.path}(current=${i})}" th:text="${i}">1</a>
    						</li>
    						<li th:class="|page-item ${page.current==page.total?'disabled':''}|">
    							<a class="page-link" th:href="@{${page.path}(current=${page.current+1})}">下一页</a>
    						</li>
    						<li class="page-item">
    							<a class="page-link" th:href="@{${page.path}(current=${page.total})}">末页</a>
    						</li>
    					</ul>
    				</nav>

![20191017195702746.png][]

![20191017195715712.png][]

![20191017195735481.png][]

[20191017195702746.png]: /images/20230531/dc302f8e062349aa9d56c2cc9354baf2.png
[20191017195715712.png]: /images/20230531/c80f556d46324137b0f3dda113ae6387.png
[20191017195735481.png]: /images/20230531/65e6ad8c5a1549548f2837c83cd08f6d.png